Avantor Inc. (AVTR) Insider Trading

Last 12 months

Insiders bought $8.69M on the open market and sold nothing.

Net open-market

+$8.69M

8 buys · 0 sales

Under a 10b5-1 plan

—

no sales

Insiders who bought / sold

5 / 0

executives and directors

Last open-market buy

May 2026

May 8, 2026

Get an email when AVTR's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
May 8	Gregory T Lucier Director	Bought	10,000	$8.32	$83k	12%	Form 4
May 1	Simon Dingemans Director	Bought	25,000	$8.14	$204k	402%	Form 4
Mar 10	Sanjeev K Mehra Director	Bought	125,000	$8.01	$1M	35%	Form 4
Feb 19	Gregory T Lucier Director	Bought	50,000	$9.16	$458k	572%	Form 4
Feb 12	Gregory L Summe Director	Bought	100,000	$9.40	$940k	28%	Form 4
Dec 5, 2025	Sanjeev K Mehra Director	Bought	350,000	$11.09	$3.88M	4318%	Form 4
Nov 17, 2025	Emmanuel Ligner President and CEO	Bought	87,500	$11.35	$993k	45%	Form 4
Oct 30, 2025	Gregory L Summe Director	Bought	100,000	$11.25	$1.13M	39%	Form 4
Aug 21, 2025	Gregory L Summe Director	Bought	100,000	$12.56	$1.26M	63%	Form 4
Aug 5, 2025	Steven W Eck SVP & Chief Accounting Officer	Sold10b5-1 plan	3,476	$11.39	$40k	5.9%	Form 4
May 23, 2025	Gregory L Summe Director	Bought	30,000	$12.50	$375k	23%	Form 4
May 22, 2025	Gregory L Summe Director	Bought	20,000	$12.65	$253k	18%	Form 4
May 7, 2025	Gregory L Summe Director	Bought	25,000	$12.00	$300k	100%	Form 4
Apr 29, 2025	Joseph R Massaro Director	Bought	8,100	$12.30	$100k	30%	Form 4
Apr 28, 2025	Gregory L Summe Director	Bought	25,000	$12.50	$313k	61%	Form 4
Apr 28, 2025	Lan Kang Director	Bought	5,000	$12.57	$63k	17%	Form 4
Apr 28, 2025	Jonathan M Peacock Director	Bought	8,091	$12.81	$104k	4.2%	Form 4
Feb 26, 2025 – Feb 27, 2025	James Bramwell EVP Sales, Customer Excellence	Sold10b5-1 plan 2 parts	4,532	$17.44 average	$79k	5.0%	Form 4
Feb 26, 2025 – Feb 27, 2025	Steven W Eck SVP & Chief Accounting Officer	Sold10b5-1 plan 2 parts	5,940	$17.44 average	$104k	13%	Form 4

May 8
Gregory T Lucier
Director · bought 10,000 at $8.32
$83k
12% of stake
May 1
Simon Dingemans
Director · bought 25,000 at $8.14
$204k
402% of stake
Mar 10
Sanjeev K Mehra
Director · bought 125,000 at $8.01
$1M
35% of stake
Feb 19
Gregory T Lucier
Director · bought 50,000 at $9.16
$458k
572% of stake
Feb 12
Gregory L Summe
Director · bought 100,000 at $9.40
$940k
28% of stake
Dec 5, 2025
Sanjeev K Mehra
Director · bought 350,000 at $11.09
$3.88M
4318% of stake
Nov 17, 2025
Emmanuel Ligner
President and CEO · bought 87,500 at $11.35
$993k
45% of stake
Oct 30, 2025
Gregory L Summe
Director · bought 100,000 at $11.25
$1.13M
39% of stake
Aug 21, 2025
Gregory L Summe
Director · bought 100,000 at $12.56
$1.26M
63% of stake
Aug 5, 202510b5-1 plan
Steven W Eck
SVP & Chief Accounting Officer · sold 3,476 at $11.39
$40k
5.9% of stake
May 23, 2025
Gregory L Summe
Director · bought 30,000 at $12.50
$375k
23% of stake
May 22, 2025
Gregory L Summe
Director · bought 20,000 at $12.65
$253k
18% of stake
May 7, 2025
Gregory L Summe
Director · bought 25,000 at $12.00
$300k
100% of stake
Apr 29, 2025
Joseph R Massaro
Director · bought 8,100 at $12.30
$100k
30% of stake
Apr 28, 2025
Gregory L Summe
Director · bought 25,000 at $12.50
$313k
61% of stake
Apr 28, 2025
Lan Kang
Director · bought 5,000 at $12.57
$63k
17% of stake
Apr 28, 2025
Jonathan M Peacock
Director · bought 8,091 at $12.81
$104k
4.2% of stake
Feb 26, 2025 – Feb 27, 202510b5-1 plan
James Bramwell
EVP Sales, Customer Excellence · sold 4,532 at avg $17.44
$79k
5.0% of stake
Feb 26, 2025 – Feb 27, 202510b5-1 plan
Steven W Eck
SVP & Chief Accounting Officer · sold 5,940 at avg $17.44
$104k
13% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch AVTR, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in AVTR's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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